Malicious PDF — malware analysis report

Static analysis result for SHA-256 b83a9fb8a8bfeda7…

MALICIOUS

PDF

33.9 KB Created: 2021-07-07 22:05:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: ba4848274162df7e54890b3b7153cff1 SHA-1: d6a87a63ff8725deb33a39e8c83fe848b29f840a SHA-256: b83a9fb8a8bfeda7157c28871798adb26fa1e611daa58cfec281ca26bdb5351f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a known malicious redirector infrastructure, specifically advertising free game hacks and Robux. The ML classifier strongly flagged this PDF as malicious. The document body and embedded URLs indicate a lure for users seeking in-game currency or cheats, likely leading to further malicious content or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://netcdn.tw/app/431946152/free-robux-images-game-hack In PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/roblox-free-wings_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/free-robux-working_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/free-robux-no-scam_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/roblox-code-for-break-free_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/broken-bones-iv-hack-roblox_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/android-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/how-can-i-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/how-to-get-free-minecraft-alts_GM479516143.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/minecraft-for-ipad-free_GM479516143.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/infinite-fly-hack-roblox_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/roblox-how-to-be-copletely-white-free_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/coin-master-free-spins-today-daily-links_GM406889139.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/how-to-hack-mcpe-master-coins_GM406889139.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/hacks-roblox_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/roblox-tower-defense-simulator-hack-script_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/hack-speed-vehicle-simulator-roblox_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/ways-to-get-robux_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/free-robux-no-download_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/coin-master-daily-free-spins-link-today-2021-free_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00002f1b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2F1B 21836 bytes
SHA-256: 552fb07ed3b9ea1d143408dc2e966182da89e2d8c3bb9c04b8d55a81415316a9
font_01_sfnt_off00005f9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F9A 18976 bytes
SHA-256: f6715e88b90fcea68fd90ecb14bc0b4d412decc30ec826ef46449e8ff66567a5

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